How to realize text inversion in php

This article introduces the relevant knowledge of "how to achieve text inversion in php". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Php to achieve text inversion methods: 1, using the strrev function to achieve inversion; 2, by dividing the string into an array, and then traversing the splicing to achieve inversion; 3, the use of recursion to achieve inversion.

This article operating environment: windows7 system, PHP7.1 version, DELL G3 computer

How does php achieve text inversion?

Three methods of reversing string in php

(suppose you have the string abcd, use php to flip the string)

1. The first kind of php has its own function strrev that can be easily implemented:

$str = 'abcd';// the first native strrev implementation to flip echo strrev ($str)

Output effect:

two。 Is to split the string into an array, and then traverse the splicing:

Function joinStrrev ($str) {if (strlen ($str))